FILE – Visitors hold their hands out to receive the sun’s energy as they celebrate the Spring equinox atop the Pyramid of the Sun in Teotihuacan, Mexico, Thursday, March 21, 2019.

The vernal equinox marks the start of spring in the Northern Hemisphere — so does that mean this is the only day out of the year when you’ll be able to balance an egg? Or not see your own shadow?

FILE – Visitors hold their hands out to receive the sun’s energy as they celebrate the Spring equinox atop the Pyramid of the Sun in Teotihuacan, Mexico, Thursday, March 21, 2019.

FILE – Visitors hold their hands out to receive the sun’s energy as they celebrate the Spring equinox atop the Pyramid of the Sun in Teotihuacan, Mexico, Thursday, March 21, 2019.

Spring is here — officially, at least. The vernal equinox arrived on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in the Southern Hemisphere.

Spring is here — officially, at least. The vernal equinox arrived on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in the Southern Hemisphere.

Spring is here — officially, at least. The vernal equinox arrived on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in the Southern Hemisphere.

Spring is here — officially, at least. The vernal equinox arrived on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in the Southern Hemisphere.

Spring is here — officially, at least. The vernal equinox arrived on Thursday, marking the start of the spring season for the Northern Hemisphere and the fall in the Southern Hemisphere.

The Northern Hemisphere’s spring — or vernal — equinox can land between March 19 and 21, depending on the year. Its fall – or autumnal — equinox can land between Sept. 21 and 24.

FILE – Visitors hold their hands out to receive the sun’s energy as they celebrate the Spring equinox atop the Pyramid of the Sun in Teotihuacan, Mexico, Thursday, March 21, 2019.